body {
    display: flex;
    justify-content: center;
    align-items: center;
    height: 100vh;
    margin: 0;
}

.container {
    text-align: center;
}

.color-box {
    width: 200px;
    height: 200px;
    margin: 20px auto;
    border: 2px solid black;
}

button {
    font-size: 18px;
    padding: 10px 20px;
    cursor: pointer;
}
